What if Heller had turned out the other way?
Prof. Nick Johnson asks the question, in the Wake Forest Law Review. His points are practical rather than legal ones. (1) The only supply-side gun control that would have a chance of affecting crime is a ban and confiscation, all this toying around with assault weapons and similar issues is mere symbolism that affects nothing. (2) Anyone who thinks a ban and confiscation would work is delusional.
Some really interesting figures at pp. 854-55: gist of them is that, looking at the question worldwide, no one -- Indians, French, Mexicans, Germans -- complies even with modest controls.
Hat tip to Don Kates....